Greenish-blue dyes of the anthraquinone series.



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WILHELM HERZBERG, OF BEBLIN-WILMERSDOBF, AND GERHARD HOPPE, OF BERLIN- TREPTOW, GERMANY, ASSIGNORS TO ACIIEN GESELLSCHAFT FER 'AI TLIN FABRI- KATION, OF BERLIN, GERMANY.

GREEN ISH-IBLUE DYES OF THE ANTHRAQUINONE SERIES.

No Drawing.

To all whom it may concern:

Be it known that we, WILHELDIHERZ- BERG and GERHARD HOPPE, citizens of the German Empire, and residents of BerlinlVilmersdorf, Germany, and BerlinTreptow, Germany, respectively, our post-office addresses being Prinzregentenstrasse'. l2, Berlin-\Vilmersdorf, Germany, and Rethelstrasse 2, Berlin-Treptow, Germany, have invented certain new and useful Improve ments in Greenish-Blue Dyes of the Anthraquinone' Series, of which the following is a specification.

Our present invention relates to new dyes of the anthraquinone series soluble in water and dyeing wool from an acid dyeing bath greenish-blue tint: of excellent fastness to light. They correspond to the general formula:

R meaning an aromatic radical.

The new dyes may be manufactured by heating a 1amino-4-halogenanthraquinone- 2-sulfonic acid with a primary aromatic amino compound in presence of water and a catalyst, such as copper or a copper com-* Specification of Letters Patent.

Patented Mar. 9,1915.

Application filed tiny 1, 1914. serial no. 848,430.

they :form salts, for example with hydrochloric acid blue-red hydrochlorids.

The following example, the parts being by weight, illustratethe manufacture of the dye. 20 parts of l-amino l-bromoanthra- 'quino'ne-2 -sulfonic acid, 12 parts of calcined sodium carbonate, 1. part of crystallized cop-.

1-aminoanthraquinone-Q-sulfonic acid of the formula l l I and is a blue crystalline powder which, as also the sodium salt, dissolves in water to a greenish-blue solution. From the feebly acid or alkaline solution strong acids precipitate corresponding salts, for instance hydrochloric acid precipitates the blue-red hydrochloric crystallizing in needles. Wool isdved clear greenish-blue tints.

If in the foregoing example the l-toluidin is replaced by other aromatic amins, for instance by 2-naphthylamin, similar dyes are produced.

Having now particularly described our mvention what we clalm 1s,-

1. The new dyes which'are in the dry pulverized shape dark blue powders soluble in water with a greenish-bluecolor, which form with hydrochloric acid blue-red hydrochlorids, which dye wool greenish-bide tints ,and which correspond to the general for- R meaning an aromatic radical.

2. The new dye which is in the dry gulverized shape a dark blue powder soluble,

in water with a greenish-blue'color, the dye forming with hydrochloric acid a blue-red hydrochlorid, the dye producing on wool greenish-blue tints and c'onsisting'of 4= .-paratolylaminoanthraquinone-2-sulfouic acid of the formula:

\g' or In testimony whereof we have hereunto set our hands in presence of two subscribing 

